Using only 25mm could be a learning curve, but it is restricted for many situations where 12-50 matches.

While the IQ of the 25 is better, in the end it is _much more_ important to choose the right focal length in a situation than somewhat better sharpness or color. You can improve these in post process, but you can't go wider with 25mm, and I doubt that cropping it to 50mm would result better IQ than zooming the 12-50 to 50mm.

Long story short: coose the 25mm when it is justified, but you will be restricted if you use it as 'only lens'.

BHPhotog wrote:

I just spent 4 days with the Panasonic/Leica 25mm, comparing/contrasting to my 12-50 OM-D kit lens.

As expected, the IQ of the 25mm is stunningly good; the ability to shoot wide open and soften/blur the background was a revelation; the ability to shoot low light amazing. It is as good as the reports say.

But now the question: is anybody using onlyoneprime on the OM-D or comparable MFT camera?

I accept the greater flexibility of the zoom, and the ideal setup would be a range of primes, but what about a single lens prime setup? This one or another. How is that working out for anyone out there? Problems, benefits of the one-lens kit...